Thank you for taking the time to file a bug report.
By inspecting the logs I see that you tried to install MySQL and MariaDB
together. As you might have noticed, they are incompatible with each
other; therefore, when you try to install one of them, the other is
automatically removed. However, this removal sometimes leaves behind
some application-specific data that causes an error when the new package
is installed on top of the old one.
Having said that, I investigated the problem further and was able to
reproduce the error. If I start a Focal lxd container and do:
# apt install mariadb-server mariadb-client && apt install mysql-
client-8.0 && apt install mysql-server && apt-get install --reinstall
mysql-server && apt install mariadb-client-core-10.3
The system will be left in this inconsistent state w.r.t. MySQL.
Further attempts to remove/purge the mysql-server package failed, and
even trying to inspect the status of mysqld.service did not work:
# systemctl status mysqld.service
Unit mysqld.service could not be found.
I am marking this bug as Triaged; we will have to further analize what
the problem is.
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1902348
Title:
package mysql-server-8.0 8.0.22-0ubuntu0.20.04.2 failed to
install/upgrade: installed mysql-server-8.0 package pre-removal script
subprocess returned error exit status 1
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